Sensitive ion detection device and method for analysis of compounds as vapors in gases
US8653449B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2008 |
| Grant date | Feb 18, 2014 |
| Priority date | — |
| Expiry date | Jan 18, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ion mobility spectrometer (IMS) for the detection of trace gaseous molecular compounds dissolved or suspended in a carrier gas, particularly in ambient air, without preconcentration or the trapping of analyte particles. The IMS of the invention comprises an ionization volume of greater than 5 cm3 and preferably greater than 100 cm3. The larger size ionizers of this invention enable analysis of trace (<1 ppb) of sample compounds in the gas phase. To facilitate efficient ion motion through the large volume ionization and reaction regions of the IMS, an electric field gradient can be provided in the ionization region or in both the ionization and reaction regions. The systems can be implemented with radioactive ionization sources, corona discharge ion sources or ions can be formed by photoionization. In specific embodiments, particularly when the sample gas is ambient air, the sample gas is heater prior to entry into the instrument, the instrument is run at temperatures above ambient, and the instrument can be heated by contact with heated sample gas exiting the instrument.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.